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PC87200 PCI to ISA Bridge

August 1999

PC87200 PCI to ISA Bridge

1.0 General Description

The PC87200 Enhanced Integrated PCI-to-ISA bridge

works with an LPC chipset to provide ISA slot support. It is

a complement to the National Semiconductor PC8736x

Super I/O family.

2.2 PCI-to-ISA Bridge

鈥?PCI 2.1 compliant 33 MHz bus

鈥?Supports PCI initiator-to-ISA and ISA master-to-PCI

cycle translations

鈥?Subtractive agent for unclaimed transactions (see the

PROHIBIT signal description for exceptions)

鈥?Parallel to Serial IRQ conversion including

IRQ3,4,5,6,7,9,10,11,12,14,15

鈥?Supports 4 ISA slots directly without buffering

鈥?Programmable ISA clock (8.33 to 11 MHz)

鈥?Slow slew rate on edges

2.0 Features

2.1 General

鈥?Functionally compatible with Intel 82380AB

鈥?5.0 V tolerant PCI and ISA interfaces

鈥?Slave mode serialized IRQ support for both quiet and

continuous modes

鈥?PC/PCI DMA support

鈥?32-bit address decode for the 1MB BIOS ROM

鈥?Supports ISA bus mastering

鈥?160-pin PQFP package

2.3 "PROHIBIT" functional support

鈥?Disables PCI bus subtractive decoding when PRO-

HIBIT is asserted

Block Diagram

PCI Bus

Serialized IRQ

Interface

PCI to X-Bus / X-Bus to PCI Bridge

PC87200 Support

PCI Con鏗乬uration

Registers

Decoding logic

X-Bus Arbiter

PROHIBIT

BPD#

X-Bus

PCPCIREQ#

Serial IRQ Slave

mode interface logic

ISA bus Target

Interface

ISA bus Master

Interface

PC/PCI DMA

Interface

PCPCIGNT#

ISA Bus

TRI-STATE廬 is a registered trademark of National Semiconductor Corporation.

漏

1999 National Semiconductor Corporation

www.national.com

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